.content{
	width:780px;
	margin:0 auto;
	padding-top:60px;
}
.content a:focus{background:url(../images/menu_btn_active.png)}
.content a{display:inline-block;width:210px;height:40px;text-align:center;background:url(../images/menu_btn.png) no-repeat;color:#fff;line-height:40px;font-size:20px;float:left;margin:10px 25px;}